The first thing a Muslim studies in fiqh is purification, for it is the gateway to prayer — a fundamental pillar of Islam, the pillar of the religion, the act a Muslim performs most often in his life and the link between him and his Lord. A Muslim must therefore understand prayer and purification, which is its gateway and condition.
This book sets out both in detail, with their conditions and rulings and the contemporary questions related to them, according to the school of Imam al-Shafi'i, in a distinctive style that uses tree diagrams to simplify and clarify.